Elements
38

Sr

Strontium

Strontium (Sr) is a silvery-yellow soft metal that has the atomic number 38 in the periodic table. It is an Alkaline Earth Metal and is located in Group 2 of the periodic table. It has the symbol Sr.

Strontium is a highly reactive metal that often forms a dark oxide layer when exposed to air. It does not occur in its elemental form but is often found in the minerals celestine and strontianite. Strontium is also a radioactive element, Sr90 is found in nuclear reactors and is also a large component of nuclear fallout that can easily be absorbed and damage the body. Strontium is named after the the Scottish village of Strontian, where it was discovered in 1790 by Adair Crawfod and William Cruickshank and was isolated by Humphry Davy in 1808 when he analysed it using spectroscopy. In the 19th Century it was used mainly in the production of sugar beet and later in cathode ray tube televisions, since the invention of LED’s the use of strontium has declined dramatically. Strontium is mainly used as a compound, for example Strontium aluminate is used in glow in the dark toys and Strontium carbonate used in fire works. Strontium is located in Group 2, an Alkaline Earth metals. It has a melting point of 777°c and a boiling point of 1377°c.

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FAQ's

What is the Melting Point for Strontium?

Strontium has a Melting Point of 769°F, meaning at 769°F it will turn to a liquid.

What is the Boiling Point for Strontium?

Strontium has a Boiling Point of 1384°F, meaning at 1384°F it will turn to a Gas.

What is the Electronegativity of Strontium?

Strontium's Electronegativty is 0.95. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Strontium?

Strontium has a Heat of Vaporization of 144 kJ/mol.

Uses

Used in flares and fireworks for crimson color. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions.

Sources

Found in minerals celestite and strontianite.

38
Protons
38
Electrons
50
Neutrons

Sr

Element Symbol
Sr
Atomic Weight
87.62
Atomic Number
38
State
Solid
Melting Point
Unknown
769
°C
Boiling Point
1384
Unknown
°C
Heat of Vaporization
144
Unknown
kJ/mol
Crystal Structure
Cubic: Face centered
Thermoconductivity
0.353
Unknown
W/cmK
Shells
2,8,18,8,2
Group
Alkali Earth Metal
Period
5
Block
S Block
Orbitals
[Kr] 5s2
Coefficient of Thermal Expansion
22.5 10^-6 K^-1
Covalent Radius
1.91 Å
Density at 293K
2.6 g/cm³
Electrical Conductivity
0.0762 10^6/cm ohm
First Ionization Potential
5.6948 V
Second Ionization Potential
11.03 V
Third Ionization Potential
43.60 V
Ionic Radius
1.26 (+2) Å
Oxydation States
2
Lattice Parameter
6.0851 Å
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

STRON-she-em

Discovered by

A. Crawford

Discovery date

1790

Orbital configuration
2,8,18,8,2

Download the Periodic Table

Explore Other Alkali Earth Metals

226
88

Ra

Radium
137.327
56

Ba

Barium
24.305
12

Mg

Magnesium
40.078
20

Ca

Calcium
9.012
4

Be

Beryllium
Alkaline earth metals is the second most reactive group of elements in the periodic table. They are found in group 2 of the periodic table (formally known as group IIA).
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